linux-kernel - [PATCH 1/2] lib/stackdepot: Bail out in __stack_depot_save() if the stack

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Date:   Thu, 10 Aug 2023 15:47:03 +0800
From:   Xiaolei Wang <xiaolei.wang@...driver.com>
To:     catalin.marinas@....com, akpm@...ux-foundation.org,
        glider@...gle.com, andreyknvl@...il.com, vbabka@...e.cz,
        zhaoyang.huang@...soc.com
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] lib/stackdepot: Bail out in __stack_depot_save() if the stack_table is not allocated

The __stack_depot_save() may be used by some subsystems even before
the stack depot is initialized. So add a check of stack_table in
__stack_depot_save() to make sure no oops in this case.

Fixes: 56a61617dd22 ("mm: use stack_depot for recording kmemleak's backtrace")
Signed-off-by: Xiaolei Wang <xiaolei.wang@...driver.com>
---
 lib/stackdepot.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/stackdepot.c b/lib/stackdepot.c
index 2f5aa851834e..a0651d013a0d 100644
--- a/lib/stackdepot.c
+++ b/lib/stackdepot.c
@@ -376,7 +376,7 @@ depot_stack_handle_t __stack_depot_save(unsigned long *entries,
 	 */
 	nr_entries = filter_irq_stacks(entries, nr_entries);
 
-	if (unlikely(nr_entries == 0) || stack_depot_disabled)
+	if (unlikely(nr_entries == 0) || stack_depot_disabled || unlikely(!stack_table))
 		goto fast_exit;
 
 	hash = hash_stack(entries, nr_entries);
-- 
2.25.1